// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// This code was auto-generated, is not intended to be edited, and is subject to
// significant change. Please see the README file for more information.

library services.src.search.search_engine;

import 'dart:async';

import 'package:analysis_services/index/index.dart';
import 'package:analysis_services/search/search_engine.dart';
import 'package:analyzer/src/generated/element.dart';
import 'package:analyzer/src/generated/source.dart';


/**
 * A [SearchEngine] implementation.
 */
class SearchEngineImpl implements SearchEngine {
  final Index _index;

  SearchEngineImpl(this._index);

  @override
  Future<List<SearchMatch>> searchMemberDeclarations(String name) {
    NameElement element = new NameElement(name);
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        element,
        IndexConstants.IS_DEFINED_BY,
        MatchKind.NAME_DECLARATION);
    return requestor.merge().then((matches) {
      return matches.where((match) {
        return match.element.enclosingElement is ClassElement;
      }).toList();
    });
  }

  @override
  Future<List<SearchMatch>> searchMemberReferences(String name) {
    NameElement element = new NameElement(name);
    _Requestor requestor = new _Requestor(_index);
    // rought
//    requestor.add(
//        element,
//        IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED,
//        MatchKind.NAME_REFERENCE_RESOLVED);
//    requestor.add(
//        element,
//        IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED,
//        MatchKind.NAME_REFERENCE_UNRESOLVED,
//        isResolved: false);
    // granular resolved operations
    requestor.add(
        element,
        IndexConstants.NAME_IS_INVOKED_BY_RESOLVED,
        MatchKind.NAME_INVOCATION_RESOLVED);
    requestor.add(
        element,
        IndexConstants.NAME_IS_READ_BY_RESOLVED,
        MatchKind.NAME_READ_RESOLVED);
    requestor.add(
        element,
        IndexConstants.NAME_IS_READ_WRITTEN_BY_RESOLVED,
        MatchKind.NAME_READ_WRITE_RESOLVED);
    requestor.add(
        element,
        IndexConstants.NAME_IS_WRITTEN_BY_RESOLVED,
        MatchKind.NAME_WRITE_RESOLVED);
    // granular unresolved operations
    requestor.add(
        element,
        IndexConstants.NAME_IS_INVOKED_BY_UNRESOLVED,
        MatchKind.NAME_INVOCATION_UNRESOLVED,
        isResolved: false);
    requestor.add(
        element,
        IndexConstants.NAME_IS_READ_BY_UNRESOLVED,
        MatchKind.NAME_READ_UNRESOLVED,
        isResolved: false);
    requestor.add(
        element,
        IndexConstants.NAME_IS_READ_WRITTEN_BY_UNRESOLVED,
        MatchKind.NAME_READ_WRITE_UNRESOLVED,
        isResolved: false);
    requestor.add(
        element,
        IndexConstants.NAME_IS_WRITTEN_BY_UNRESOLVED,
        MatchKind.NAME_WRITE_UNRESOLVED,
        isResolved: false);
    // done
    return requestor.merge();
  }

  @override
  Future<List<SearchMatch>> searchReferences(Element element) {
    if (element.kind == ElementKind.ANGULAR_COMPONENT ||
        element.kind == ElementKind.ANGULAR_CONTROLLER ||
        element.kind == ElementKind.ANGULAR_FORMATTER ||
        element.kind == ElementKind.ANGULAR_PROPERTY ||
        element.kind == ElementKind.ANGULAR_SCOPE_PROPERTY ||
        element.kind == ElementKind.ANGULAR_SELECTOR) {
      return _searchReferences_Angular(element as AngularElement);
    } else if (element.kind == ElementKind.CLASS) {
      return _searchReferences_Class(element as ClassElement);
    } else if (element.kind == ElementKind.COMPILATION_UNIT) {
      return _searchReferences_CompilationUnit(
          element as CompilationUnitElement);
    } else if (element.kind == ElementKind.CONSTRUCTOR) {
      return _searchReferences_Constructor(element as ConstructorElement);
    } else if (element.kind == ElementKind.FIELD ||
        element.kind == ElementKind.TOP_LEVEL_VARIABLE) {
      return _searchReferences_Field(element as PropertyInducingElement);
    } else if (element.kind == ElementKind.FUNCTION) {
      return _searchReferences_Function(element as FunctionElement);
    } else if (element.kind == ElementKind.GETTER ||
        element.kind == ElementKind.SETTER) {
      return _searchReferences_PropertyAccessor(
          element as PropertyAccessorElement);
    } else if (element.kind == ElementKind.IMPORT) {
      return _searchReferences_Import(element as ImportElement);
    } else if (element.kind == ElementKind.LIBRARY) {
      return _searchReferences_Library(element as LibraryElement);
    } else if (element.kind == ElementKind.LOCAL_VARIABLE) {
      return _searchReferences_LocalVariable(element as LocalVariableElement);
    } else if (element.kind == ElementKind.METHOD) {
      return _searchReferences_Method(element as MethodElement);
    } else if (element.kind == ElementKind.PARAMETER) {
      return _searchReferences_Parameter(element as ParameterElement);
    } else if (element.kind == ElementKind.FUNCTION_TYPE_ALIAS) {
      return _searchReferences_FunctionTypeAlias(
          element as FunctionTypeAliasElement);
    } else if (element.kind == ElementKind.TYPE_PARAMETER) {
      return _searchReferences_TypeParameter(element as TypeParameterElement);
    }
    return new Future.value(<SearchMatch>[]);
  }

  @override
  Future<List<SearchMatch>> searchSubtypes(ClassElement type) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        type,
        IndexConstants.IS_EXTENDED_BY,
        MatchKind.EXTENDS_REFERENCE);
    requestor.add(
        type,
        IndexConstants.IS_MIXED_IN_BY,
        MatchKind.WITH_REFERENCE);
    requestor.add(
        type,
        IndexConstants.IS_IMPLEMENTED_BY,
        MatchKind.IMPLEMENTS_REFERENCE);
    return requestor.merge();
  }

  @override
  Future<List<SearchMatch>> searchTopLevelDeclarations(String pattern) {
    UniverseElement universe = UniverseElement.INSTANCE;
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        universe,
        IndexConstants.DEFINES_CLASS,
        MatchKind.CLASS_DECLARATION);
    requestor.add(
        universe,
        IndexConstants.DEFINES_CLASS_ALIAS,
        MatchKind.CLASS_ALIAS_DECLARATION);
    requestor.add(
        universe,
        IndexConstants.DEFINES_FUNCTION_TYPE,
        MatchKind.FUNCTION_TYPE_DECLARATION);
    requestor.add(
        universe,
        IndexConstants.DEFINES_FUNCTION,
        MatchKind.FUNCTION_DECLARATION);
    requestor.add(
        universe,
        IndexConstants.DEFINES_VARIABLE,
        MatchKind.VARIABLE_DECLARATION);
    RegExp regExp = new RegExp(pattern);
    return requestor.merge().then((List<SearchMatch> matches) {
      return matches.where((SearchMatch match) {
        String name = match.element.displayName;
        return regExp.hasMatch(name);
      }).toList();
    });
  }

  Future<List<SearchMatch>> _searchReferences_Angular(AngularElement element) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        element,
        IndexConstants.ANGULAR_REFERENCE,
        MatchKind.ANGULAR_REFERENCE);
    requestor.add(
        element,
        IndexConstants.ANGULAR_CLOSING_TAG_REFERENCE,
        MatchKind.ANGULAR_CLOSING_TAG_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>> _searchReferences_Class(ClassElement clazz) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        clazz,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.TYPE_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_CompilationUnit(CompilationUnitElement unit) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        unit,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.UNIT_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_Constructor(ConstructorElement constructor) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        constructor,
        IndexConstants.IS_DEFINED_BY,
        MatchKind.CONSTRUCTOR_DECLARATION);
    requestor.add(
        constructor,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.CONSTRUCTOR_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_Field(PropertyInducingElement field) {
    PropertyAccessorElement getter = field.getter;
    PropertyAccessorElement setter = field.setter;
    _Requestor requestor = new _Requestor(_index);
    // field itself
    requestor.add(
        field,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.FIELD_REFERENCE);
    requestor.add(
        field,
        IndexConstants.IS_REFERENCED_BY_QUALIFIED,
        MatchKind.FIELD_REFERENCE);
    // getter
    if (getter != null) {
      requestor.add(
          getter,
          IndexConstants.IS_REFERENCED_BY_QUALIFIED,
          MatchKind.FIELD_READ);
      requestor.add(
          getter,
          IndexConstants.IS_REFERENCED_BY_UNQUALIFIED,
          MatchKind.FIELD_READ);
      requestor.add(
          getter,
          IndexConstants.IS_INVOKED_BY_QUALIFIED,
          MatchKind.FIELD_INVOCATION);
      requestor.add(
          getter,
          IndexConstants.IS_INVOKED_BY_UNQUALIFIED,
          MatchKind.FIELD_INVOCATION);
    }
    // setter
    if (setter != null) {
      requestor.add(
          setter,
          IndexConstants.IS_REFERENCED_BY_QUALIFIED,
          MatchKind.FIELD_WRITE);
      requestor.add(
          setter,
          IndexConstants.IS_REFERENCED_BY_UNQUALIFIED,
          MatchKind.FIELD_WRITE);
    }
    // done
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_Function(FunctionElement function) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        function,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.FUNCTION_REFERENCE);
    requestor.add(
        function,
        IndexConstants.IS_INVOKED_BY,
        MatchKind.FUNCTION_EXECUTION);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_FunctionTypeAlias(FunctionTypeAliasElement alias) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        alias,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.FUNCTION_TYPE_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>> _searchReferences_Import(ImportElement imp) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        imp,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.IMPORT_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>> _searchReferences_Library(LibraryElement library) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        library,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.LIBRARY_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_LocalVariable(LocalVariableElement variable) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(variable, IndexConstants.IS_READ_BY, MatchKind.VARIABLE_READ);
    requestor.add(
        variable,
        IndexConstants.IS_READ_WRITTEN_BY,
        MatchKind.VARIABLE_READ_WRITE);
    requestor.add(
        variable,
        IndexConstants.IS_WRITTEN_BY,
        MatchKind.VARIABLE_WRITE);
    requestor.add(
        variable,
        IndexConstants.IS_INVOKED_BY,
        MatchKind.FUNCTION_EXECUTION);
    return requestor.merge();
  }

  Future<List<SearchMatch>> _searchReferences_Method(MethodElement method) {
    _Requestor requestor = new _Requestor(_index);
    if (method is MethodMember) {
      method = (method as MethodMember).baseElement;
    }
    requestor.add(
        method,
        IndexConstants.IS_REFERENCED_BY_QUALIFIED,
        MatchKind.METHOD_REFERENCE);
    requestor.add(
        method,
        IndexConstants.IS_REFERENCED_BY_UNQUALIFIED,
        MatchKind.METHOD_REFERENCE);
    requestor.add(
        method,
        IndexConstants.IS_INVOKED_BY_QUALIFIED,
        MatchKind.METHOD_INVOCATION);
    requestor.add(
        method,
        IndexConstants.IS_INVOKED_BY_UNQUALIFIED,
        MatchKind.METHOD_INVOCATION);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_Parameter(ParameterElement parameter) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        parameter,
        IndexConstants.IS_READ_BY,
        MatchKind.VARIABLE_READ);
    requestor.add(
        parameter,
        IndexConstants.IS_READ_WRITTEN_BY,
        MatchKind.VARIABLE_READ_WRITE);
    requestor.add(
        parameter,
        IndexConstants.IS_WRITTEN_BY,
        MatchKind.VARIABLE_WRITE);
    requestor.add(
        parameter,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.NAMED_PARAMETER_REFERENCE);
    requestor.add(
        parameter,
        IndexConstants.IS_INVOKED_BY,
        MatchKind.FUNCTION_EXECUTION);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_PropertyAccessor(PropertyAccessorElement accessor) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        accessor,
        IndexConstants.IS_REFERENCED_BY_QUALIFIED,
        MatchKind.PROPERTY_ACCESSOR_REFERENCE);
    requestor.add(
        accessor,
        IndexConstants.IS_REFERENCED_BY_UNQUALIFIED,
        MatchKind.PROPERTY_ACCESSOR_REFERENCE);
    return requestor.merge();
  }

  Future<List<SearchMatch>>
      _searchReferences_TypeParameter(TypeParameterElement typeParameter) {
    _Requestor requestor = new _Requestor(_index);
    requestor.add(
        typeParameter,
        IndexConstants.IS_REFERENCED_BY,
        MatchKind.TYPE_PARAMETER_REFERENCE);
    return requestor.merge();
  }
}


class _Requestor {
  final List<Future<List<SearchMatch>>> futures = <Future<List<SearchMatch>>>[];
  final Index index;

  _Requestor(this.index);

  void add(Element element2, Relationship relationship, MatchKind kind,
      {bool isResolved: true}) {
    Future relationsFuture = index.getRelationships(element2, relationship);
    Future matchesFuture = relationsFuture.then((List<Location> locations) {
      bool isQualified =
          relationship == IndexConstants.IS_REFERENCED_BY_QUALIFIED ||
          relationship == IndexConstants.IS_INVOKED_BY_QUALIFIED;
      List<SearchMatch> matches = <SearchMatch>[];
      for (Location location in locations) {
        Element element = location.element;
        matches.add(
            new SearchMatch(
                kind,
                element,
                new SourceRange(location.offset, location.length),
                isResolved,
                isQualified));
      }
      return matches;
    });
    futures.add(matchesFuture);
  }

  Future<List<SearchMatch>> merge() {
    return Future.wait(futures).then((List<List<SearchMatch>> matchesList) {
      return matchesList.expand((matches) => matches).toList();
    });
  }
}